Method

Set the oven to gas mark 6 or 200°C. Rinse the halibut, pat dry with absorbent kitchen paper and place on a baking sheet.

To make the crust, mix together breadcrumbs, lemon zest, chopped chives and seasoning, and then stir in olive oil. Divide the mixture between the halibut steaks and press on to the top of each. Bake the fish in centre of the oven for 20-25 mins, or until crust is a light-golden colour.

Meanwhile, make the mash. Place potatoes and leeks in a pan and cover with water. Bring to the boil and then simmer for 20-25 mins, or until potatoes are just tender. Drain vegetables, add olive oil and seasoning to pan. Mash well.

Spoon some mash on to a plate and top with the crusted halibut. Garnish with some chives before serving. (Not suitable for freezing).